211828725 has 18 divisors (see below), whose sum is σ = 379409186. Its totient is φ = 112975200.

The previous prime is 211828723. The next prime is 211828733. The reversal of 211828725 is 527828112.

It can be written as a sum of positive squares in 3 ways, for example, as 65950641 + 145878084 = 8121^2 + 12078^2 .

It is not a de Polignac number, because 211828725 - 2¹ = 211828723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211828725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211828723) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 470506 + ... + 470955.

Almost surely, 2^211828725 is an apocalyptic number.

211828725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211828725 is a deficient number, since it is larger than the sum of its proper divisors (167580461).

211828725 is a wasteful number, since it uses less digits than its factorization.

211828725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941477 (or 941469 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 211828725 is about 14554.3369824943. The cubic root of 211828725 is about 596.1125759525.

The spelling of 211828725 in words is "two hundred eleven million, eight hundred twenty-eight thousand, seven hundred twenty-five".